JP2010064165A - Deep hole machining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deep hole machining device capable of detecting a failure depending on a machining state. <P>SOLUTION: The deep hole machining device for forming a deep hole in a workpiece includes: a tubular tool having a cutting blade attached to a chip; a rotary driving unit for rotating the tubular tool around a shaft; a reciprocation unit for reciprocating the rotary driving unit; an oil supply unit for supplying a cutting oil toward the cutting blade of the tubular tool; a pressure measuring part provided in an oil passage for the cutting oil supplied from the oil supply unit for measuring a pressure of the cutting oil; a memory for storing data indicating a relation between a machining depth of the tubular tool into the workpiece during normal machining, and the pressure measured by the pressure measuring part at each machining depth, and an irregular pressure at each machining depth defined based on the data; and a control part for controlling the drive of the rotary driving unit and the reciprocation unit when the pressure measured by the pressure measuring part reaches the irregular pressure. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a deep hole machining apparatus for forming a deep hole in a workpiece.

  As a deep hole processing apparatus for forming a deep hole in a workpiece, for example, a BTA (Boring & Trepanning Association) type apparatus is known. In this apparatus, a deep hole is formed in a workpiece by rotating a cylindrical boring bar having a cutting edge attached to the tip. At this time, high-pressure cutting oil is supplied from the gap between the boring bar and the workpiece. And this cutting oil is discharged | emitted with the inside of a boring bar with a chip.

By the way, in the deep hole machining apparatus described in Patent Document 1, in order to detect an abnormality in the machining state, the pressure of the cutting oil is measured, and a warning signal is generated when a predetermined pressure is detected. Yes. When an alarm signal is generated, the apparatus is stopped as necessary.
Japanese Utility Model Publication No. 4-76307

  However, in deep hole machining, since the pressure of the cutting oil is constantly changing, the pressure indicating abnormality is also constantly changing. Therefore, uniformly defining the pressure for generating an alarm signal as in Patent Document 1 does not match the actual situation of processing, and there is a possibility that the apparatus may be stopped even if the pressure is not abnormal.

  The present invention has been made to solve the above problems, and an object thereof is to provide a deep hole machining apparatus capable of detecting an abnormality according to a machining state.

  The present invention is a deep hole machining apparatus for forming a deep hole in a workpiece, which is made to solve the above-described problem, and includes a tubular tool having a cutting edge attached to a tip, and the tubular tool around an axis. A rotary drive unit that rotates in a rotating manner, an advance / retreat unit that advances and retracts the rotary drive unit, an oil supply unit that supplies cutting oil toward the cutting blade of the tubular tool, and oil of the cutting oil supplied from the oil supply unit The relationship between the pressure measuring unit that is provided in the path and measures the pressure of the cutting oil, the machining depth of the tubular tool to the workpiece during normal machining, and the pressure measured by the pressure measuring unit at each machining depth And a storage unit that stores abnormal pressure at each processing depth defined based on the data, and when the pressure measured by the pressure measurement unit reaches the abnormal pressure, It comprises a control unit for controlling the driving of the rotation drive unit and reciprocating unit.

  According to this configuration, data indicating the relationship between the machining depth of the tubular tool to the workpiece and the pressure of the cutting oil during normal machining is stored in advance, and the abnormal pressure is defined based on this data. When the measured pressure reaches an abnormal pressure, the controller controls the driving of the rotation drive unit and the advance / retreat unit. The cutting oil pressure tends to increase as the machining depth of the tubular tool increases, so if abnormal pressure is specified for each machining depth in this way, abnormalities according to actual machining conditions are detected. can do. On the other hand, in the conventional example, the abnormal pressure defined at any machining depth is constant, so that when the machining depth is short, there is a possibility that it cannot be detected even if an abnormality occurs. On the other hand, in the present invention, the abnormal pressure corresponding to each machining state, particularly each machining depth, is set, so that the tool can be prevented from being damaged in any machining state.

  Note that data in various processing conditions can be stored in the storage unit. In other words, since the machining state changes depending on the type of workpiece and cutting edge, cutting conditions, etc., if data for each machining condition is accumulated and an abnormal pressure is set according to the accumulated data, it can handle various machining conditions. be able to. Further, when an abnormal pressure is detected, it is possible to perform control such as stopping and deceleration of the rotary drive unit.

  In the above apparatus, the oil supply unit can be composed of a tank containing cutting oil and a hydraulic circuit that supplies the cutting oil from the tank to the tubular tool, and further, a safety valve is provided in the hydraulic circuit. It is possible to provide the first divided flow path and the second divided flow path provided with the throttle valve. In the hydraulic circuit configured as described above, if resistance is generated in the flow of the cutting oil due to clogging of chips, for example, the measured pressure increases. Therefore, the above-described control becomes possible.

  In the above apparatus, the hydraulic circuit can be provided with a plurality of oil passages extending in parallel from the tank and joined together, and each oil passage can be provided with a plurality of pumps having different outputs. Then, the cutting oil is supplied toward the tubular tool by driving at least one pump. By carrying out like this, cutting oil can be supplied according to required output, for example, pumping capacity. For example, when the amount of oil required is small, any one pump may be used, and when the amount of oil is large, several pumps may be driven simultaneously. Thereby, it becomes possible to supply cutting oil efficiently.

  The apparatus can be configured as follows. First, a support unit for supporting the tubular tool is further provided, and the support unit is constituted by a main body portion and a first pressing portion that can be advanced and retracted on the main body portion. And a 1st press part is made to contact | abut to a workpiece | work while supporting a tubular tool rotatably. Thereby, a workpiece | work can be hold | maintained firmly and a tubular tool can be driven stably. Further, a supply flow path for supplying the cutting oil supplied from the oil supply unit to the outer peripheral surface of the tubular tool is formed in the first pressing portion, and the cutting oil passes through the outer peripheral surface of the tubular tool. Supply to the cutting edge side of the tubular tool. Then, the cutting oil is collected through the inside of the tubular tool together with the chips. Since this structure supplies cutting oil through the outer peripheral surface of a tubular tool, it can be applied to BTA type deep hole machining.

  Moreover, the 2nd press part which can advance / retreat on a main-body part can also be further prepared. This 2nd press part is made to contact | abut to a workpiece | work while supporting a tubular tool rotatably. Then, the oil supply unit supplies the cutting oil to the cutting blade side through the inside of the tubular tool, and the second pressing portion has a recovery flow path through which the cutting oil that has passed through the outer peripheral surface of the tubular tool passes along with the cutting powder. Form. Since this structure supplies cutting oil from the inside of a tubular tool, it can be applied to a gun drill. Moreover, since the 1st and 2nd press part can be selectively attached to a base part, according to processing conditions, BTA and a gun drill can be used properly, for example.

  According to the deep hole machining apparatus of the present invention, an abnormality can be detected according to the machining state.

  Hereinafter, an embodiment in which a deep hole machining apparatus according to the present invention is applied to a BTA type machining apparatus will be described with reference to the drawings. FIG. 1 is a front view of a BTA processing apparatus according to the present embodiment, and FIG. 2 is a plan view of FIG. In the following description, the right side of FIG. 1 may be described as the front end side or the front side, and the left side may be described as the rear end side or the rear side.

  As shown in FIG. 1, the apparatus includes a base 1 and a rotary drive unit 2 that is disposed on the base 1 and rotates a tool. The tool is a tubular tool 3 extending in a long shape to perform deep hole machining, and a cutting edge is attached to the tip. And it extends toward the workpiece W that is detachably fixed to the upper surface of the table 15 on the right side of the base 1. A pair of guide rails 11 extending in the left-right direction in FIG. 1 are arranged in parallel on the base 1, and the rotary drive unit 2 can move along the guide rails 11. A feed motor 12 for moving the rotary drive unit 2 is disposed at the rear end of the base 1.

  A pressure head 4 that presses the left side surface of the workpiece W is disposed at the right end of the base 1, and the pressure head 4 rotatably supports the tubular tool 3 as described later. It plays the role of supplying cutting oil to the part. Further, between the pressure head 4 and the rotary drive unit 2, a steady rest 13 for rotatably supporting the tubular tool 3 is disposed. A first oil receiver 14 that presses the right side surface of the work W is disposed concentrically on the opposite side of the pressure head 4 across the work W. That is, at the time of machining, when the workpiece W is narrowed by the pressure head 4 and the first oil receiver 14 and cutting oil discharged from the tubular tool 3 described later penetrates the right side surface of the workpiece W. The first oil receiver 14 receives it.

  As shown in FIG. 2, the base 1 is adjacent to a trough 5 through which used cutting oil and chips are passed, and extends in the longitudinal direction of the base 1. The eaves 5 are formed in a T-shape including a main channel 51 extending along the base 1 and a separation channel 52 separated from the main channel 51. The separation channel 52 separates the chips and the cutting oil. It extends to the separation unit 6. The main channel 51 is inclined toward the branch channel 52, and the cutting oil discharged to the main channel 51 flows into the branch channel 52. Further, the separation unit 6 is adjacent to an oil supply unit 7 that collects the separated cutting oil and supplies it to the pressure head 4.

  FIG. 3 is a partially cutaway sectional view of the rotary drive unit. As shown in the figure, the rotary drive unit 2 includes a housing 21 with a motor (not shown) built therein, and a tubular member 22 for passing cutting oil is disposed inside the housing 21, and is arranged in the left-right direction. It extends. An adapter 23 that rotates integrally with the motor is attached to the tip of the housing 21, and the tubular member 22 and the tubular tool 3 are connected in a liquid-tight manner via the adapter 23. In this state, the tubular member 22 and the tubular tool 3 communicate with each other so that liquid can pass therethrough. The tubular tool 3 is rotated around the axis by a motor (not shown) together with the tubular member 22. The tubular member 22 is fixed and held in a hollow shaft 27 that rotates integrally with the motor. The rear end portion of the hollow shaft 27 protrudes from the casing 21, and a cutting oil discharge pipe 28 is concentrically connected to the tubular member 22. The rear end of the discharge pipe 28 is inserted into the opening of the second oil receiver 24. As shown in FIG. 2, since the second oil receiver 24 extends to the main flow path 51 of the flange 5, the second oil receiver 24 is always on the main flow path 51 even when the rotary drive unit 2 advances and retreats. Therefore, the cutting oil is discharged to the main flow path 51 regardless of the position of the rotary drive unit 2.

  FIG. 4 is a cross-sectional view of the pressure head. As shown in the figure, the pressure head 4 has a base 41 and a main body 42 disposed on the upper surface thereof. A through hole 421 extending in the left-right direction in FIG. 4 is formed in the main body 42, and a cylinder 44 and a support body 43 that supports the cylinder 44 are attached to the through hole 421. The support body 43 is formed so as to surround the outer peripheral surface of the cylinder 44, and supports the cylinder 44 so as to be able to advance and retract. The cylinder 44 is a double-acting hydraulic cylinder, and the cylinder 44 is moved backward by supplying pressure oil from a flow path 432 formed at the top of the tip of the support 43. On the other hand, the cylinder 44 is advanced by supplying pressure oil from a flow path 433 formed at the lower part of the tip of the support 43.

  A bush 442 is attached to the front end surface of the cylinder 44 facing the workpiece W, and a through-hole 441 extending in the front-rear direction is formed in the cylinder 44 concentrically with the bush 442. A tubular tool 3 is inserted. A gap is formed between the outer peripheral surface of the tubular tool 3 and the inner wall surface of the through hole 441, and extends to the rear end of the bush 442. A cutting oil supply channel 444 is formed from the upper portion of the support 43 to the cylinder 44 so as to communicate with the gap, and the tubular tool 3 and the support 43 are formed from the supply channel 444. Cutting oil is supplied to the gap. Further, as shown in FIG. 5, a cutting blade 31a protruding radially outward is attached to the tip of the tubular tool 3, and the height of the outer peripheral surface is made to coincide with the rotation trajectory of the tip of the cutting blade 31a. A plurality of pads 31b are arranged in the radial direction. Therefore, a gap is always formed between the outer peripheral surface of the tubular tool 3 and the inner peripheral surface of the bush 442 or the inner peripheral surface of the machining hole. Drilling is performed. An annular oil seal 442a is attached to the tip of the bush 442 that contacts the workpiece W so as to surround the tubular tool 3 so that the cutting oil does not leak to the outside. On the other hand, an oil seal 443 that is in close contact with the tubular tool 3 is attached to the rear end portion of the inner wall surface of the cylinder 44 so that oil does not leak backward. Further, the chips generated during the processing are discharged from the inner space 32 of the tubular tool 3 together with the cutting oil, and are discharged from the rear end portion of the rotary drive unit 2 described above to the basket 5 through the discharge pipe 28.

  Next, the separation unit and the oil supply unit will be described with reference to FIG. FIG. 6 is a schematic configuration diagram of these units including a hydraulic circuit. As shown in the figure, the separation unit 6 is provided with first and second oil tanks 61 and 62 arranged adjacent to each other. The first oil tank 61 is provided with a magnet conveyor 63 that separates the chips and cutting oil, and the cutting oil supplied from the basket 5 is poured onto the magnet conveyor 63. The magnet conveyor 63 is configured so that the conveyor operates from the inside of the first oil tank 61 to the outside, and the chips mixed with the cutting oil are adsorbed by the conveyor. The chips are discharged to the outside of the first oil tank 61 by the conveyor and are collected in the collection box 65. On the other hand, the cutting oil stored in the first oil tank is cooled by the oil cooler 64. Then, the cutting oil overflowing from the first oil tank 61 is stored in the adjacent second oil tank 62.

  As shown in FIG. 6, the oil supply unit 7 is disposed adjacent to the separation unit 6. The oil supply unit 7 includes a tank 71 for storing cutting oil and a hydraulic circuit for supplying cutting oil from the tank 12 toward the tubular tool 3. In the tank 71, the cutting oil is pumped up and stored by the pump 66 from the second oil tank 62 of the separation unit 6. The hydraulic circuit is configured as follows.

  First, two pumping oil passages 72a and 72b for pumping cutting oil from the tank 71 are provided. Pumps having different pumping capacities, that is, a small output pump 721a and a large output pump 721b are attached to the oil passages 72a and 72b. The oil passages 72a and 72b join to form a main oil passage 73, which is connected to a three-position switching type directional switching valve 74. From the direction switching valve 74, an oil passage 75a for BTA and an oil passage 75b for a gun drill to be described later extend. At the center position shown in the drawing, the direction switching valve 74 does not flow cutting oil into either oil passage, Cutting oil flows in the oil passage 75a when the right position is placed in the center, and flowing into the oil passage 75b when the left position is placed in the center. The pumping oil passages 72a and 72b are connected to oil passages 76a and 76b that branch to the tank 71 side, and safety valves 761a and 761b are attached to the oil passages 76a and 76b, respectively. Further, an oil passage 77 for diverting to the tank 71 side is also connected to the main oil passage 73, and a flow rate adjusting valve 771 including a throttle valve is attached to the oil passage 77.

  Further, in this hydraulic circuit, a hydraulic gauge 8 for measuring the hydraulic pressure in the main oil path 73 is provided. The oil pressure measured by the oil pressure gauge 8 is monitored by a control unit 9 constituted by a computer. When an abnormal pressure described later is detected, the driving of the apparatus is stopped.

  Next, the operation of the deep hole machining apparatus configured as described above will be described. First, the pressure head 4 is driven to bring the cylinder 44 into contact with the workpiece W. Next, in the hydraulic circuit of the oil supply unit 7, the switching valve 74 is switched to the BTA side in the illustrated right position, and then the pump 721 is driven to supply cutting oil to the tubular tool 3 side. At this time, the amount of oil to be supplied is adjusted according to the diameter of the tubular tool 3. That is, the cutting oil is supplied by appropriately operating one of the low-output and high-output pumps 721a and 721b or combining them appropriately. Subsequently, the rotary drive unit 2 is advanced toward the workpiece W while rotating the tubular tool 3. Thus, deep hole machining is performed on the workpiece W. At this time, as described above, the cutting oil passes through the outer peripheral surface of the tubular tool 3 from the supply flow path 444 and is supplied to the processing site, and passes through the internal space 32 of the tubular tool 3 together with the chips to the ridge 5. And discharged. Thereafter, the chips and cutting oil are separated in the separation unit 6, and the cutting oil is cooled by the oil cooler 64, stored in the tank 71, and supplied to the tubular tool 3 again.

  Next, a method for detecting cutting abnormality in the deep hole machining apparatus will be described. The cutting abnormality means that, for example, the chip is clogged in the tubular tool 3, so that the hydraulic pressure becomes high and the tool is broken or damaged. In order to detect this abnormality, first, the pressure in a normal state is measured. As described above, since the throttle valve 771 is provided in the main oil path 73 in the hydraulic circuit, the hydraulic pressure increases if resistance occurs in the flow of the cutting oil. That is, as the tubular tool 3 moves forward and the machining depth on the workpiece W becomes longer, the pressure of the cutting oil increases. Therefore, data indicating the relationship between the processing depth of the tubular tool and the hydraulic pressure during normal operation is recorded. FIG. 7 shows an example. The figure shows data when only a low-power pump is used, and data when both pumps are used. Based on this data, the abnormal pressure at each processing depth is defined. That is, a pressure higher than the measured data by a predetermined pressure ΔP is defined, and this is set as an abnormal pressure. The abnormal pressure can be set empirically and theoretically based on data at the time of occurrence of a past abnormality. These data and the set abnormal pressure are stored in a storage unit such as a hard disk or a memory. Such data can be stored for each type of workpiece or cutting edge and machining conditions.

  At the time of machining, the pressure is sequentially measured by the pressure gauge 8, and when an abnormal pressure is detected from the relationship with the machining depth of the tubular tool 3, the control unit 9 immediately rotates and advances the tool 3. Stop. Thereby, damage to a tool can be prevented beforehand.

  As described above, according to the present embodiment, data indicating the relationship between the machining depth of the tubular tool 3 to the workpiece W and the pressure of the cutting oil during normal machining is stored in advance, and abnormal pressure is based on this data. Is stipulated. When the measured pressure reaches an abnormal pressure, the controller 9 adjusts the driving of the rotation drive unit 2 and the feed motor 12. Since the pressure of the cutting oil tends to increase as the machining depth of the tubular tool 3 becomes longer, if an abnormal pressure is defined for each machining depth in this way, an abnormality corresponding to the actual machining state is caused. Can be detected. Therefore, tool breakage and the like can be prevented in any processing state.

  Incidentally, as described above, in the apparatus according to the above-described embodiment, a gun drill can be used in addition to a BTA-type tool. Therefore, in order to use the gun drill, it is necessary to exchange parts of the pressure head and the rotary drive unit in addition to the tool. First, the tool will be described. FIG. 8 is a front view of the tubular member 10 showing the gun drill. As shown in the figure, the gun drill tubular tool 10 is used when machining a deep hole having a smaller diameter than BTA. The distal end of the tubular tool 10 has a cross section in which a fan-shaped cutout 101 is formed, and the cutout surface 101 is used as a cutting edge for processing. Further, the cutting oil is supplied from the irregularly shaped inner space 102 of the tubular tool. In order to attach such a tubular tool 10, the pressure head is configured as shown in FIG. FIG. 9 is a cross-sectional view of a pressure head for a gun drill. The pressure head is different from that shown in FIG. 4 in the configuration of a cylinder 46 and a support body 45 that supports the cylinder 46. The base 41 and the main body 42 are the same as BTA. That is, when the gun drill is used, the cylinder 46 and the support body 45 are exchanged.

  As shown in FIG. 9, the cylinder 46 of this pressure head is a double-acting hydraulic cylinder. As in the case of FIG. 4, the support body 45 is formed with a through hole 451 that supports the cylinder 46 so as to advance and retreat, and oil passages 452 and 453 for pressure oil for forward and backward movement. As a difference, a supply flow path for supplying cutting oil is not provided. An opening 421 is formed on the lower surface of the rear end portion of the support 45 and communicates with a discharge port 411 provided in the base 41. In addition, this discharge port 411 is connected to the trough 5 which collects cutting oil.

  A through hole 461 extending in the front-rear direction is formed inside the cylinder 46, and the tubular tool 10 is inserted into the through hole 461. Further, the through hole 461 is formed so as to expand toward the rear end, and communicates with the through hole 451 of the support body 45. That is, the through hole 461 of the cylinder 46 communicates with the discharge port 411 of the base 41. A bush 462 having a through hole 461 is attached to the tip of the cylinder 46. The bush 462 rotatably supports the tubular tool 10 and abuts against the workpiece W. An annular protrusion 463 that surrounds the periphery of the tubular tool 10 is integrally formed at a contact portion with the workpiece W.

  Next, the rotation drive unit will be described with reference to FIG. FIG. 10 is a cross-sectional view of the rotary drive unit for a gun drill. The rotational drive unit 2 shown in the figure is different from that shown in FIG. 3 in an adapter for attaching the tubular tool 10 and a discharge pipe. The adapter 25 is configured to support the tubular tool 10 for a gun drill and to communicate the tubular tool 10 with the tubular member 22 inside the housing 21 in a fluid-tight manner. Moreover, in this gun drill, in order to supply cutting oil to the internal space 102 of the tubular tool 10, a swivel joint type connecting member that connects a pipe extending from the oil supply unit 7 to the rear end of the hollow shaft 27 of the casing 21. 26 is mounted concentrically with the tubular member 22. The connecting member 26 is fixed to the frame of the rotary drive unit 2 and connects a rotatable oil transfer portion (not shown) inside the tubular member 22. Therefore, when the gun drill tubular tool 10 is used, the discharge pipe 28 at the rear end of the hollow shaft 27 shown in FIG. 3 is replaced with the connecting member 26, and the adapter 25 at the front end of the rotary drive unit 2 is replaced for the gun drill. After that, the tubular tool 10 is attached. The opening of the second oil receiver 24 is closed. As another difference, as shown in FIG. 6, an oil passage 75b for a gun drill is formed in the hydraulic circuit. The difference from the BTA oil passage 75a is that a throttle valve 751b is attached.

  Next, the operation when this deep hole machining apparatus is used as a gun drill will be described. First, the pressure head 4 is driven to bring the bush 462 of the cylinder 46 into contact with the workpiece W. Next, in the hydraulic circuit of the oil supply unit 7, after the switching valve 74 is switched to the gun drill in the left position in the figure, the pump 721 is driven to supply cutting oil to the tubular tool 10 side. Subsequently, the rotary drive unit 2 is advanced toward the workpiece W while rotating the tubular tool 10. Thus, deep hole machining is performed on the workpiece W. At this time, the cutting oil is supplied to the inside of the tubular tool 10 from the rear end portion of the rotary drive unit 2 and flows into the machining site as described above. Thereafter, the cutting oil flows together with the chips between the notch 101 of the tubular tool 10 and the inner peripheral surface of the bush 462 and through the through hole 461 to the discharge port 411 of the base 41, and into the flange 5. Discharged. Thereafter, the chips and cutting oil are separated in the separation unit 6, and the cutting oil is cooled, stored in a tank, and supplied to the tubular tool 10 again.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to this Embodiment, A various change is possible unless it deviates from the meaning. For example, the BTA type and gun drill tubular tools are not limited to those shown in FIG. 5 and FIG. 8 described above, but can be applied to BTA type and gun drills in a general form. It is.

It is a front view of the BTA type processing device concerning this embodiment. It is a top view of FIG. It is a partially cutaway sectional view of a rotation drive unit. It is sectional drawing of a pressure head. It is a front view of the front-end | tip of a BTA type tubular tool. It is a schematic block diagram of these units including a hydraulic circuit. It is a graph which shows the relationship between the processing depth of a tubular tool at the time of normal operation, and hydraulic pressure. It is a front view of the tubular member which shows a gun drill. It is sectional drawing of the pressure head for gun drills. It is sectional drawing of the rotational drive unit for gun drills.

Explanation of symbols

1 base (advance / retreat unit)
11 Guide rail (advance / retreat unit)
12 Feeding motor (advance / retreat unit)
2 Rotary drive unit 3 Tubular tool (BTA method)
31 Cutting blade 32 Internal space 4 Pressure head (support unit)
42 Main body 44 Cylinder (first pressing part)
46 cylinder (second pressing part)
7 Oil supply unit 71 Tank 721a Small output pump 721b Large output pump 761a, 761b Safety valve 77 Dividing flow path
771 Throttle valve 8 Pressure gauge (pressure measuring part)
9 Control unit 10 Tubular tool (gun drill)

Claims (5)

A deep hole processing device for forming a deep hole in a workpiece,
A tubular tool with a cutting edge attached to the tip;
A rotary drive unit for rotating the tubular tool about an axis;
An advancing / retreating unit for advancing / retreating the rotary drive unit;
An oil supply unit that supplies cutting oil toward the cutting edge of the tubular tool;
A pressure measuring unit that is provided in an oil passage of cutting oil supplied from the oil supply unit and measures the pressure of the cutting oil;
Data indicating the relationship between the machining depth of the tubular tool to the workpiece during normal machining and the pressure measured by the pressure measuring unit at each machining depth, and each machining depth defined based on the data A storage unit for storing the abnormal pressure at the time;
When the pressure measured by the pressure measurement unit reaches the abnormal pressure, a control unit that controls the driving of the rotation drive unit and the advance / retreat unit;
A deep hole machining device. The oil supply unit includes a tank in which cutting oil is stored, and a hydraulic circuit that supplies the cutting oil from the tank to the tubular tool,
The deep hole machining apparatus according to claim 1, wherein the hydraulic circuit includes a first branch channel provided with a safety valve and a second branch channel provided with a throttle valve. The hydraulic circuit has a plurality of oil passages extending in parallel from the tank and merging,
3. The depth according to claim 2, wherein each oil passage is provided with a plurality of pumps having different outputs, and the cutting oil is supplied toward the cutting edge of the tubular tool by driving at least one of the pumps. Hole processing device. A support unit for supporting the tubular tool;
The support unit includes a main body part and a first pressing part supported by the main body part so as to be able to advance and retreat.
The first pressing portion rotatably supports the tubular tool and abuts on a work,
In the first pressing portion, a supply flow path for supplying cutting oil supplied from the oil supply unit to the outer peripheral surface of the tubular tool is formed,
The cutting oil passes through the outer peripheral surface of the tubular tool and is supplied to the cutting edge side of the tubular tool, and is collected through the internal space of the tubular tool together with the chips. The deep hole processing apparatus in any one. A second pressing portion supported by the main body portion so as to be capable of moving forward and backward;
The second pressing portion rotatably supports the tubular tool and abuts on a work,
The oil supply unit supplies cutting oil to the cutting blade side through the inside of the tubular tool,
In the second pressing part, a recovery flow path is formed through which cutting oil that has passed through the outer peripheral surface of the tubular tool together with the chips passes.
The deep hole processing device according to claim 4, wherein the first and second pressing portions can be selectively attached to the main body portion.

Images